1/* $NetBSD: firmload.c,v 1.1 2017/08/10 20:43:12 jmcneill Exp $ */ 2 3/*- 4 * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/param.h> 30#include <sys/sysctl.h> 31#include <fcntl.h> 32#include <stdio.h> 33#include <stdlib.h> 34#include <string.h> 35 36#include "firmload.h" 37 38#define HW_FIRMWARE_PATH "hw.firmware.path" 39#define HW_FIRMWARE_PATH_DELIM ":" 40 41static int 42firmware_search(char *paths, const char *drvname, const char *imgname) 43{ 44 char *p, *f; 45 const int debug = getenv("FIRMWARE_DEBUG") != NULL; 46 int fd; 47 48 p = strtok(paths, HW_FIRMWARE_PATH_DELIM); 49 while (p) { 50 if (asprintf(&f, "%s/%s/%s", p, drvname, imgname) == -1) 51 return -1; 52 if (debug) 53 printf("%s: trying %s...\n", __func__, f); 54 fd = open(f, O_RDONLY); 55 free(f); 56 if (fd != -1) { 57 if (debug) 58 printf("%s: using image at %s\n", __func__, f); 59 return fd; 60 } 61 p = strtok(NULL, HW_FIRMWARE_PATH_DELIM); 62 } 63 64 /* Not found */ 65 return -1; 66} 67 68int 69firmware_open(const char *drvname, const char *imgname) 70{ 71 size_t len; 72 char *paths; 73 int fd; 74 75 paths = asysctlbyname(HW_FIRMWARE_PATH, &len); 76 if (paths == NULL) 77 return -1; 78 79 fd = firmware_search(paths, drvname, imgname); 80 81 free(paths); 82 83 return fd; 84} 85